Improvement in tipping-chairs



Hi K W HITE Tipping Chairs.

AM, P/loTa-umamfH/c ca me (ossa/ms mams) accompany and form part of thisspecification,

t to the stool or pedestal, is connected with the two of the spider-armsin bearings fixed to UNITED STATES PATENT CEEIcE.

HENRY K. lWHITE, OF CHELSEA, ASSIGNOR TOPARKEB, WHITE St CO., OF

BOSTON, MASSACHUSETTS.

IMPROVEMENT IN TIPPINGCHAIRS.

Specification forming part of Letters Patent No. -May 6,

To all whom it may concern:

Be it known that I, HENRY K. WHITE, of Chelsea, in the county of Suffolkand State of Massachusetts, have invented an Improvement in ApplyingSprings to Tipping-Chairs; and I do hereby declare that the following,taken in connection with the drawings which is a description of myinvention sufficient to enable those skilled in the art to practice it.

My invention relates to an improved construction of the spring mechanismof tippingchairs, ot' that class in which a spider, fastenedchairLbottom or seat, and the seat tips against the stress of springsinterposed between the chair-seat and the spider.

In my invention l pivot the outer ends .of

the under side of the seat, and in one side of the ear or plate fromwhich the bearing ex,A tends I form a notch, while from the spiderarmadjacent to the pivot I extend a shoulder. Around the pivot I place astout coiled spring with one end held in said notch, and the other by'said shoulder, each end of the spring having a suitable nut. Thebearing-plates being fastened to the under side of the seat, and thespider-pivots being in their bearings or sockets, the seat when tippedcauses the springs to contract, the seat tipping against the stress ofthe springs, While, when the seat is released, the expansion of thesprings re turns the seat to its normal or horizontal position.

My invention consists in the combination and arrangement of the pivotalconnections and the spring-holding and controlling notches andshoulders.

The drawin g represents the pivoted" end of one of the spider-arms, andthe bearing and spring combined with such pivot.

Figure l shows the mechanism, partly in section and partly in plan. Fig.2 is an end view of the bearing and spring. Fig. 3 shows the spring inend view, looking toward the pivot.

139,639, dated June 3, 187'3; application'led 1873. l

a denotes a part of one of the spider-arms, having at its end thegudgeon or pivot b, said pivot being journaled in a bearing, c, formedin a boss or cylinder, d, extending from an ear,I f, that projects downfrom a plate, g, which plate g is fastened to the bottom or undersurface of the chair-seat. Extending from the spider-arm a is the arm orshoulder h, the end of which is turned, as seen in Fig.r

1, and in the inner side of the ear is formed a notch, i. Around thebearing-tube or cylinder is placed the coiled spring k, and while oneend of the spring extends into the notch a nut, l, bearing against theend of the ear to conline the spring. The other end of the spring passesbehind the shoulder h and is confined by a nut, m. When the chair tips,the ear f, acting against the nut l,A contracts the spring, the oppositeend of the spring being held by the nut m, and the spring expanding tobring the seat to normal position, suitable stops determining themovement of the seat for this normal or horizontal positon.

To apply the spring or eli'ect the connection (one ot' the bearings andits spring beingl in position, and the spider in readiness) the springis slipped upon the bearings, and the bearing over the pivot, and thehearing-plate gis then screwed to the chair-seat, the connection beingthus readily and easily el'ected,

and needing no tools, other than an ordinary screw-driver.

By turning the nuts m the stress ofthe spring may be increased `ordiminished, as may be desirable.

I claim- The spider-arm pivot b, having the shoulder h, and thebearing-cylinder d encompassed by the spring k, andhaving the notch fi,the

respective ends of the springs-being arranged I with relation to theshoulder h and notch i,

substantially as shown and described.

Executed this 22d day ot' April, A. D. 1873.

HENRY K. WHITE.

Witnesses FRANCIS GOULD, M. W. FRoTHINeHAM.

